  <tr class="detalle_row">
    <% fields_for "concurso[ventas_attributes][]", venta do |v|%>
      <td><%= v.collection_select(:marca_id, @marcas, :id, :nombre, {:include_blank => true}) %></td>
      <td><%= v.text_field(:puntos_copa) %></td>
      <td><%= link_to_function "Quitar", "$(this).up('.detalle_row').remove()" %></td>    
    <% end %>
  </tr>
